(Mac and non-mac hardware is pretty different when assembled as a whole. All the separate pieces are mainly the same as others, but the whole is different) First off, I prefer the UI. Everything looks much nicer than on Windows and is also smoother. Then (though not Software), the trackpad. Many Windows machines' trackpads don't work at the same time as the keyboard, and the mac trackpad is the best in the world. Then it's the Finder. Much easier to use than the Windows Explorer and faster too. The display of the files/folders more customisable too. Then; Spotlight. It's basically a Google but for your computer: you can use it to search the web, wikipedia, anywhere in your user directory (not Library) and do calculations, use the dictionary, etc. All by pressing cmd-space. Much, much, much faster than Windows search too, as it is constantly indexing your stuff. Now, simply that the Mac OS is much lighter than the Windows one; takes less CPU to run. The Dashboard and now Launchpad, as well as Exposé are pretty awesome and ver fast. The Dock is really cool too. The built in apps are of a much higher level than the Windows ones. iMove, iPhoto and GarageBand are amazing, the Appstore is just great, the Automator good for people with a little computing knowledge, AppleScript a great time-saver, Preview can look at .psd files and is much better and faster than the Windows picture-viewer, PhotoBooth is fun and useful, the Time Machine is amazing for backing up, FaceTime is great and iDVD comes in very useful. Many of the best apps (for design and web-development/design) are on Mac but not Windows (true). The UNIX Terminal (also on LINUX) is the most powerful thing ever created. Ruby, Python and Perl come pre-installed. The free Xcode app is the most amazing IDE ever. They're all 64bit. Basically: I've been using Windows and Mac for just as long as each other and I have a much greater preference for mac (going from iMac 2  to MacBook Pro 2011).